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I was going to say that maybe the transconductance was higher on 6DQ6...but, consulting the tube manual, the specs on 6BQ6 and 6DQ6 are quite similar. Maybe your 6BQ6 is just weak? Check the b+, boost voltage, and screen and negative grid voltage on the HO tube with the photofact and see if any are abnormal. Off-value resistors could be causing voltage problems in the H.O., perhaps in the screen.
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